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From "Ning Tan (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-516) Replication: _replicate does not finish replication in one pass and has to be invoked repeatedly
Date Thu, 01 Oct 2009 16:35:23 GMT
Replication: _replicate does not finish replication in one pass and has to be invoked repeatedly
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                 Key: COUCHDB-516
                 URL: https://issues.apache.org/jira/browse/COUCHDB-516
             Project: CouchDB
          Issue Type: Bug
          Components: Database Core
    Affects Versions: 0.10
         Environment: Mac OS X 10.5 w/ CouchDB 0.10.x multiple revisions (latest is 820436)
Ubuntu Desktop 9.04 w/ CouchDB 0.10.x multiple revisions (latest is 818247)
            Reporter: Ning Tan


When we replicate between a remote database and a local one (pulling from remote into local),
we are observing partial replications, meaning that we have to issue repeated _replicate calls
for the replication to complete. For a database with 17,000 documents, for example, it could
take up to 7 calls for the entire database to replicate into an empty one. Each time, the
number of documents replicated over seemed random.

The use case is very simple--replicating a database into an empty one with no concurrent writes,
no additional load or i/o, etc. The databases involved are a mixture of the 10.0.x code base
natively built on Ubuntu and Mac.

It seems to me that every (not all) partial replication process is associated with a corresponding
entry in the log that says "recording a checkpoint at source update_seq .....". (i.e. you
can match the recorded_seq number in the replication response with the checkpoint update_seq
numbers in the log).

Futon vs. curl doesn't make a difference.

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